交联剂分子量对高吸水性树脂性能的影响

通过丙烯酰氯对聚乙二醇的封端反应合成了一系列分子量不同、结构类似的交联剂———聚乙二醇二丙烯酸酯 (PEGDA) ,并用于聚丙烯酸高吸水性树脂的制备 .运用FTIR对PEGDA进行了分析 .吸水性能实验结果表明 ,交联剂的分子量越大 ,则高吸水性树脂的吸水倍率越高 ,吸水速率越大 ,而相对吸水速率降低 .同时 ,PEGDA与常用的交联剂N ,N′ 亚甲基双丙烯酰胺 (MBA)相比 ,前者制备的高吸水性树脂的吸水倍率远高于后者 ;线型可溶性聚合物及残留单体的含量 ,前者也低于后者

THE EFFECT OF CROSSLINKERS ON SUPERABSORBENTS

A series of crosslinkers(polyethylene glycol diacrylate,PEGDA) with different molecular weights were synthesized through end-capping of PEG by acryloyl chloride .The structures of the PEGDAs were characterized by FTIR.The water-absorbency of sodium polyacrylate crosslinked with PEGDAs was determined.In the experiments of water-swelling in deionized water,it was revealed that when the molecular weight of the crosslinker increased,the maximum of equilibrium water-absorbability of the synthesized superabsorbents was enhanced and the rate of water-swelling increased too,but the relative rate of water-swelling decreased.The relationship between the network structure of the superabsorbents and the water-absorbency was also discussed.Comparing PEGDA and MBA,the superabsorbents crosslinked with the former had much stronger water-absorbability,fewer residual monomers and less dissoluble linear polymers than the one crosslinked with the latter.